Total ammonium in saltwater exceeds the limit
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This post was last edited by sunjl1981 on 2013-1-6 at 23:03. In our company, the total ammonium level in the brine has consistently been above 4 ppm. Adding sodium hypochlorite to the chute did not have any effect on reducing this level. Subsequent analysis showed that the total ammonium level in the dechlorinated fresh water was 4.72 ppm. I would like to ask fellow experts what could be the reason for the ineffective ammonium-reducing effect of sodium hypochlorite? # + + .
Reply to 1# amylovemm: An excess level of total ammonium represents a serious safety hazard, and it is necessary to conduct a thorough analysis of its sources. These sources include: 1. Raw materials such as rock salt and brine, soda ash, barium chloride, and sedimentation aids; 2. Sodium sulfite, which is used as an auxiliary material in ion exchange membranes; 3. The production process – if ammonia is used for cooling purposes to remove sulfate ions, then ammonia may end up in the saline solution. The excess ammonium in the dilute saline solution is most likely due to the addition of sodium sulfite, as either inorganic or organic amines present in such solutions should react to form nitrogen trichloride. It is also advisable to analyze the content of nitrogen trichloride in the dried product and liquid chlorine to see if there is an increase in its levels. Since I’m not very familiar with your salt-removal process and the raw materials and components used, it should be easy to analyze; let’s take a look to see if there are any issues with the analysis process.
Reply to 2# whs1964310: I would like to ask why adding too much sodium sulfite leads to an increase in total ammonium levels If dechlorinated brine containing a large amount of sodium sulfite is fed into the membrane-based nitrate removal process, will these increased amounts of ammonium salts formed as hydroxides be recycled back to the electrolyzer?